嗨,我有一个让我发疯的问题。我的项目的一个页面中有一个下拉列表,它应该像所有其他页面上的所有其他下拉列表一样,但它没有,我想知道为什么。
在这里,您将看到 cshtml 页面中的代码。这是一个正常的下拉列表:
<p>
Specify a organisation to search in
@Html.DropDownList("OrganisationList", new SelectList(ViewBag.OrganisationList, "ID", "Name", ViewBag.SelectedOrganisation))
</p>
在控制器中,我有一个绑定下拉列表的方法和一个调用视图的方法:
private void BindAllOrganisations()
{
List<OrganisationModel> OrganisationList = new List<OrganisationModel> { new OrganisationModel { ID = null, Name = "Select" } };
foreach (var Organisation in DatabaseConnection.DataContextRead.GetTable<Organisation>())
{
OrganisationList.Add(new OrganisationModel { ID = Organisation.OrganisationId, Name = Organisation.Name });
}
ViewBag.OrganisationList = OrganisationList;
}
/**
* Loads the ManageUserView with all users from a specific organisation unit
**/
[AzaraAuthorization(RequiredRoles = new[] { RolesEnum.Admin })]
public ActionResult ManageUsersFromOrgUnit(int Id)
{
try
{
var orgUnit = organisationUnitManagement.GetSingleUnit(Id);
List<AzaraUser> AzaraUserList = azaraUserManagement.GetAllUserFromOrganisationUnit(orgUnit);
ViewBag.FromOrgUnits = Id;
BindAllOrganisations();
ViewBag.SelectedOrganisation = orgUnit.Organisation.OrganisationId;
return View("ManageUsers", AzaraUserList);
}
catch (BusinessObjectNotRetrievableByIdException exc)
{
ExceptionHandling.BusinessObjectNotRetrievableByIdExceptionOccured(exc, "ManageUsersFromOrgUnit(int Id)", "ManageUsersController");
return RedirectToAction("Index", "Home", new { Info = "A program error occured. The administrator get informed. Apologize the inconvenience." });
}
}
我找不到问题。此外,如果我ViewBag.SelectedOrganisation
在页面上替换为(我知道后面的数据库中1
有一个带有值的模型),它会选择带有. 这是列表中使用的模型:1
null
public class OrganisationModel
{
public int? ID { get; set; }
public string Name { get; set; }
}
可能有错误或我错过了什么?